dav*_*ave 31 php gd image thumbnails
我想从用户上传的图像创建缩略图,因此图像看起来不会被压扁.但是也想要原始图像的副本..所以我希望原始图像将原始图像发送到我的服务器并创建一个拇指版本并将其发送到我的服务器,这样我就可以为每个用户调用它们上传自己的图片.
我的用户表有2个表
`user_pic` longblob NOT NULL,
`user_pic_small` longblob NOT NULL,
我对编码的图像方面并没有崩溃,但这是我到目前为止所拥有的.
Imageupload.php
> <form id="myForm" action="include/media.profileimage.upload.php"
> method="POST" enctype="multipart/form-data" target="ifr1">
> <input type = "file" name = "image_data" class = "input_text" style="width:800px;" >
> <input type = "submit" name = "submit" class = "btn_login" value = "Upload">
> </form>
media.profileimage.upload.php
if(isset($_FILES['image_data'])){
if(is_uploaded_file($_FILES['image_data']['tmp_name'])) {
// prepare the image for insertion
$imgData =addslashes (file_get_contents($_FILES['image_data']['tmp_name']));
// get the image info..
$size = getimagesize($_FILES['image_data']['tmp_name']);
// our sql query
$creator_id = $_SESSION['id'];
$sql = "UPDATE users SET user_pic='".$imgData."' WHERE id=$creator_id";
$sql2 = "INSERT INTO userphotos(photo_ownerid,photo_ispublic, photo_name, photo_caption, photo_imagedata) VALUES ($creator_id,1,'Profile Picture','Profile Picture','$imgData')";
// insert the image
if(!mysql_query($sql)) {
echo "Fail. It broke.";
}else{
$c=mysql_query($sql2);
echo "<script> parent.alert('Image Uploaded','',1000);</script>";
}
}
}
非常感谢任何帮助或指导.谢谢
Ale*_*lex 61
更新:
如果你想利用Imagick(如果它安装在你的服务器上).注意:我没有使用Imagick的性质,writeFile因为我在服务器上遇到了问题.文件放置内容也可以正常工作.
<?php
/**
*
* Generate Thumbnail using Imagick class
*
* @param string $img
* @param string $width
* @param string $height
* @param int $quality
* @return boolean on true
* @throws Exception
* @throws ImagickException
*/
function generateThumbnail($img, $width, $height, $quality = 90)
{
if (is_file($img)) {
$imagick = new Imagick(realpath($img));
$imagick->setImageFormat('jpeg');
$imagick->setImageCompression(Imagick::COMPRESSION_JPEG);
$imagick->setImageCompressionQuality($quality);
$imagick->thumbnailImage($width, $height, false, false);
$filename_no_ext = reset(explode('.', $img));
if (file_put_contents($filename_no_ext . '_thumb' . '.jpg', $imagick) === false) {
throw new Exception("Could not put contents.");
}
return true;
}
else {
throw new Exception("No valid image provided with {$img}.");
}
}
// example usage
try {
generateThumbnail('test.jpg', 100, 50, 65);
}
catch (ImagickException $e) {
echo $e->getMessage();
}
catch (Exception $e) {
echo $e->getMessage();
}
?>
我一直在使用它,只需在存储原始图像并使用该位置创建缩略图后执行该功能.根据自己的喜好编辑...
function makeThumbnails($updir, $img, $id)
{
$thumbnail_width = 134;
$thumbnail_height = 189;
$thumb_beforeword = "thumb";
$arr_image_details = getimagesize("$updir" . $id . '_' . "$img"); // pass id to thumb name
$original_width = $arr_image_details[0];
$original_height = $arr_image_details[1];
if ($original_width > $original_height) {
$new_width = $thumbnail_width;
$new_height = intval($original_height * $new_width / $original_width);
} else {
$new_height = $thumbnail_height;
$new_width = intval($original_width * $new_height / $original_height);
}
$dest_x = intval(($thumbnail_width - $new_width) / 2);
$dest_y = intval(($thumbnail_height - $new_height) / 2);
if ($arr_image_details[2] == IMAGETYPE_GIF) {
$imgt = "ImageGIF";
$imgcreatefrom = "ImageCreateFromGIF";
}
if ($arr_image_details[2] == IMAGETYPE_JPEG) {
$imgt = "ImageJPEG";
$imgcreatefrom = "ImageCreateFromJPEG";
}
if ($arr_image_details[2] == IMAGETYPE_PNG) {
$imgt = "ImagePNG";
$imgcreatefrom = "ImageCreateFromPNG";
}
if ($imgt) {
$old_image = $imgcreatefrom("$updir" . $id . '_' . "$img");
$new_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresized($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height);
$imgt($new_image, "$updir" . $id . '_' . "$thumb_beforeword" . "$img");
}
}
上述功能可创建具有统一缩略图大小的图像.如果图像的尺寸与指定的缩略图尺寸不同(按比例),则顶部和底部只有黑色空间.
K.K*_*ith 22
我猜你已经把这个想出来了.但我发现你将图像存储为"longblobs",导致我认为你正在存储pic的整个二进制内容.
我希望您已经意识到,只需将文件名存储在数据库中然后使用该信息从"上传"文件夹或类似文件夹中获取图片就更有意义了.
提示 - 不要保存文件路径..只是文件名..根据需要在代码中添加路径信息.这样你就可以获得最大的自由.如果需要更改文件夹结构,可以在代码中执行,而不是更改数据库记录.
Sun*_*put 13
你可以使用最简单的方法
<?php
function make_thumb($src, $dest, $desired_width) {
/* read the source image */
$source_image = imagecreatefromjpeg($src);
$width = imagesx($source_image);
$height = imagesy($source_image);
/* find the "desired height" of this thumbnail, relative to the desired width */
$desired_height = floor($height * ($desired_width / $width));
/* create a new, "virtual" image */
$virtual_image = imagecreatetruecolor($desired_width, $desired_height);
/* copy source image at a resized size */
imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
/* create the physical thumbnail image to its destination */
imagejpeg($virtual_image, $dest);
}
$src="1494684586337H.jpg";
$dest="new.jpg";
$desired_width="200";
make_thumb($src, $dest, $desired_width);
?>
Ped*_*iro 12
我知道这是一个老问题,但我偶然发现了同样的问题并尝试使用Alex的答案中给出的函数.
但是jpeg结果的质量太低了.所以我稍微改变了一下这个功能,以便在我的项目中变得更有用,并将"imagecopyresized"改为"imagecopyresampled"(根据这个推荐).
如果您对如何使用此功能有疑问,请尝试在此处查看记录良好的版本.
function createThumbnail($filepath, $thumbpath, $thumbnail_width, $thumbnail_height, $background=false) {
list($original_width, $original_height, $original_type) = getimagesize($filepath);
if ($original_width > $original_height) {
$new_width = $thumbnail_width;
$new_height = intval($original_height * $new_width / $original_width);
} else {
$new_height = $thumbnail_height;
$new_width = intval($original_width * $new_height / $original_height);
}
$dest_x = intval(($thumbnail_width - $new_width) / 2);
$dest_y = intval(($thumbnail_height - $new_height) / 2);
if ($original_type === 1) {
$imgt = "ImageGIF";
$imgcreatefrom = "ImageCreateFromGIF";
} else if ($original_type === 2) {
$imgt = "ImageJPEG";
$imgcreatefrom = "ImageCreateFromJPEG";
} else if ($original_type === 3) {
$imgt = "ImagePNG";
$imgcreatefrom = "ImageCreateFromPNG";
} else {
return false;
}
$old_image = $imgcreatefrom($filepath);
$new_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height); // creates new image, but with a black background
// figuring out the color for the background
if(is_array($background) && count($background) === 3) {
list($red, $green, $blue) = $background;
$color = imagecolorallocate($new_image, $red, $green, $blue);
imagefill($new_image, 0, 0, $color);
// apply transparent background only if is a png image
} else if($background === 'transparent' && $original_type === 3) {
imagesavealpha($new_image, TRUE);
$color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
imagefill($new_image, 0, 0, $color);
}
imagecopyresampled($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height);
$imgt($new_image, $thumbpath);
return file_exists($thumbpath);
}
小智 6
以防你需要创建最大宽度和最大高度的拇指......
function makeThumbnails($updir, $img, $id,$MaxWe=100,$MaxHe=150){
$arr_image_details = getimagesize($img);
$width = $arr_image_details[0];
$height = $arr_image_details[1];
$percent = 100;
if($width > $MaxWe) $percent = floor(($MaxWe * 100) / $width);
if(floor(($height * $percent)/100)>$MaxHe)
$percent = (($MaxHe * 100) / $height);
if($width > $height) {
$newWidth=$MaxWe;
$newHeight=round(($height*$percent)/100);
}else{
$newWidth=round(($width*$percent)/100);
$newHeight=$MaxHe;
}
if ($arr_image_details[2] == 1) {
$imgt = "ImageGIF";
$imgcreatefrom = "ImageCreateFromGIF";
}
if ($arr_image_details[2] == 2) {
$imgt = "ImageJPEG";
$imgcreatefrom = "ImageCreateFromJPEG";
}
if ($arr_image_details[2] == 3) {
$imgt = "ImagePNG";
$imgcreatefrom = "ImageCreateFromPNG";
}
if ($imgt) {
$old_image = $imgcreatefrom($img);
$new_image = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresized($new_image, $old_image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
$imgt($new_image, $updir."".$id."_t.jpg");
return;
}
}
小智 5
希望此代码有助于为 JPG、PNG 和 GIF 格式创建缩略图。
<?php
$file = "D:/server/sites/Sourcefol/high/bucket/kath23.png"; /*Your Original Source Image */
$pathToSave = "D:/server/sites/Sourcefol/high/bucket/New/"; /*Your Destination Folder */
$sourceWidth =60;
$sourceHeight = 60;
$what = getimagesize($file);
$file_name = basename($file);/* Name of the Image File*/
$ext = pathinfo($file_name, PATHINFO_EXTENSION);
/* Adding image name _thumb for thumbnail image */
$file_name = basename($file_name, ".$ext") . '_thumb.' . $ext;
switch(strtolower($what['mime']))
{
case 'image/png':
$img = imagecreatefrompng($file);
$new = imagecreatetruecolor($what[0],$what[1]);
imagecopy($new,$img,0,0,0,0,$what[0],$what[1]);
header('Content-Type: image/png');
break;
case 'image/jpeg':
$img = imagecreatefromjpeg($file);
$new = imagecreatetruecolor($what[0],$what[1]);
imagecopy($new,$img,0,0,0,0,$what[0],$what[1]);
header('Content-Type: image/jpeg');
break;
case 'image/gif':
$img = imagecreatefromgif($file);
$new = imagecreatetruecolor($what[0],$what[1]);
imagecopy($new,$img,0,0,0,0,$what[0],$what[1]);
header('Content-Type: image/gif');
break;
default: die();
}
imagejpeg($new,$pathToSave.$file_name);
imagedestroy($new);
?>